Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e70fa0a4d939589f988f1a319c35c456c3ddea44c980075f31be15d4319a20' 
  AND token = 'Z0ZEYYD9pq7ZsSxr4nNXetwy2Oop+69KlRwlAEEdChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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