Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4e7790ad41adef8ea61389c5006ad7453215fd485a234e2df1b0fe4740035c' 
  AND token = '1S6O0ZlsHVyyZVGOUAciB8oM3yqQ0QmqTocXmIvqOeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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