Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a27116187cb3413d9634415fadc79d94112605b17e51d3c82362b39fa705b6' 
  AND token = '5W47FSa5Bhes4+aGDDEZZKZF6kmKD+2FMvSeqVd0dq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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