Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568b5265c0fefcae55786717f0c9dba478b3c4f4f075b0612dbdaa1e8ec67012' 
  AND token = 'EWBkBDN+VO5P9arCsYPIRH+7t2TIduG6Am+dQ7Jivu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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