Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d356e461fe0d83504d31c55826a7255ee3c423082f4f55b24b05e885e8d7709' 
  AND token = 'cP6Okwmoh2FWIRFvYCouYsivDkqP7YNLu7XqsOaEmlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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