Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb1144ec1ab3c75548cffd65d4597c8a78f5a87393e9fe712276c55ce003a8b' 
  AND token = '71WaHMsr9FPsCs4u7N8nz9Q7zWPwwhBsMAFFZZT7T2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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