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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f32209c7a0a016afe48af3defce61c43320c1b0e11d55669b0801897f44cd59' 
  AND token = 'HXPIZWZY7vE9YcTzBsjOH54sQGKf2aMr3n9YcnkyAOg=' 
  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"
    }
  }
}