Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff82bf655b9b1cf0da467374da8e8f55f382314e80fbc5865dd5eb3bade2087' 
  AND token = 'U607sIm/iuKXZg2CSbVEpNTgTy9+oIqmRcY4cDSx0yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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