SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e04b68778236c401b5664d07be14b906b5e2c587ed5565ffcebe5b2642c83ed' 
  AND token = 'KYnWqHCZfOPGq7WV2nr1MwzKFupwIusj7N3V8ZRcU9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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