Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3a6e9ff3c6369c68282d03435eb569529a37d6cf5586f59404ab2e3ef4d7d4' 
  AND token = 'fDq6RnYO9FsTiEGQuw+ho73Jh08yV1nUxbX8v+Vx5DQ=' 
  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"
    }
  }
}