SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62d573d174e1fc8d7d93ff8b4789573192a7675f88fd392c5cf2fb00e1799e9' 
  AND token = 'jQQnheD+VKYASBXQRFV8khvuNLddoquyqvd5Ak0UwKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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