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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd396bc56a5eea839583582cd499d50ba3c670c00506004cc5bc4b657ff5b7ff8' 
  AND token = 'w9/BGdrvj/XRN0ZV41MH3rVvI0aRh59iS0MlwVgEjJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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