Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1138e1e7e53d2a1e24589a58ca92dd4da149e7e77c34b4ac794a81bc908d410' 
  AND token = 'usXufT9HmCVUo6LjsAedZcqthfnru9GsAcXFGJWHRfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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