Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd60662d9f0fa88cbd7a483d9bb1bb52e8d4e9894d06bf9570a1fc36dff6702' 
  AND token = '8sZmHwOYcGXOvgCoWewQ8SM1tcC0Nc8gwoFr3CuRzlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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