Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8ffe833ddecf23b2a8215145dbbff1781f7f959cf98c6c7a14bf0ca56a5dc3' 
  AND token = 'yIoDm1TcraMpGweOm6gtfgjhhXwHFsgHT/17SfuIAac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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