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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7053b56748c4b805122ded7e18c6a9c7549b16740319314c300a613e85583aa5' 
  AND token = 'HYz3HN7PqhUXmZ0I0eJYaS3gYSsjwYWza3uZTXhZDK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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