Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6d6f20b473c0c2fe5684987eb794a82fe12501135cc1909887366228be1a12' 
  AND token = '5mjiCR3OIyOsZIBpGi4n3GJaXgHMRXV8Diq0U010RB8=' 
  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"
    }
  }
}