SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e3504f7cec1d2a10816257b5838eaa6dc3f2b330a9e1c730779c40d89daac4' 
  AND token = 'YZhDfPorPcEebB0BOgX2DvKK7QOM5vCqSqg3zojdz+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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