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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85c93e3dac625ee29a129bf9cc56ef7e760b4c660421f7f827111971b335db0' 
  AND token = 'ngQAIp0qWKziZqq/IOrSYEO7+Ig3DZTcD9fFS1Roybc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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