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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dc4637b98c56200911bb34e3d1ff4460ab246e30f6fea0af0e83e87e503d22' 
  AND token = '24BQsQ8byKvxDDkESPKrv0J1HNjnIsNHgUI1c3PS8aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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