Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618eb1ccb8894538595572e0276f8d98abbecb72fcd64578cd2d3351f2bc55e5' 
  AND token = 'pF5YAW36ITU3Sf04eqUcm1p06arPBTB2+wW8cZ6qF/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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