Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5966889fe4eae7a2fa05c846f272a7c8979ce906bae0a221f40a9b143de99e' 
  AND token = 'ZZtfzHDlfUA+T3bELtkeHjhaQcG8DEUSkFh4PtcSRCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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