Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224c63ac6f549eb67e848559c387364598413203af5be2469023807b2b8849f8' 
  AND token = 'mNML7BK8mcF8JdWtVzVny6RSGnN6Z8mPLOTM8YHAAYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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