Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87beed5d96df4b864f3fa6a8abfc1b9778265ba072fe46662c91c6e26200193' 
  AND token = 'rw0GYWjpl8snRk8bPhDzDCA4NSb56bjmczZwfcu2D4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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