SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d688659040f681a032c4396ccd3fd0f9c65c777ba72aa893eac207a97fe0e14' 
  AND token = 'KxOp7cy9LosdjO/f1Czgtvdpp+l+awYZih9u8qqhjzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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