Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347bc50d268074e6b692f94d3dc1d70c6718b1e158929741e502bd4d08395ba1' 
  AND token = 'fceHXkV+Jf4U7sElF8q5acpT+fPm+4aZdrNYrX28MF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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