Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71f18a5699330d8bb971c079080c74376c4fe78d884d2ee053dcd2b42ef48aa' 
  AND token = 'CczUL4gQNhVSTHPhmOdBWbBOSI5u2VbWTKT5sZSooNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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