Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df65be4e997a86dbdfdc6554b0855b2c648fbac778c4d8b0bc5c35aa67a4af6d' 
  AND token = 'oFWA82qzfNr0via81uFoVqPaRqeesxFd15mCH6meh0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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