SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff416ace1325478f333f29df19fe81fe041d2d1d15fc014c6567ac2e496862ec' 
  AND token = 'fbyhSL7jwF3PhCoUI2/XRnDPh9bhOzSsg+5DAQUuKB8=' 
  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"
    }
  }
}