Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ca411962a40c3b3e0cdb1087b65b7ebbc3988b8cc007edda306091c46e56c9' 
  AND token = 'L4l7WFBFqU/LGhGSlNj/VCPrh8AInwQWfZUN0hjpcs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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