Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb0703441e0217ae2df09eb08695c9544dc71313b7adad6682f7a63b0d00857' 
  AND token = 'L1iBA9cV9i3R0QxXZ4pIh1zE2VzF+UF64kMQhJ5nOQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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