Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca73ef6484a44b00c2ad2698312b3230c6c53dc33b7e15eaa747f22750108c71' 
  AND token = '53xw8QhvCL4OSQ681oIq49BfBDNVDJqKGo2hy4rcmOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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