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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0fce38fe41f2aa64ec076143959f6b78692017aa090e96e01ea3d9ce82691d' 
  AND token = 'R3GCbs0YRS2zcoIUdMvv2USOG1nvMX9XdkyqZM4T4V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}