Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d188b3373405e3b8e9ff63b6e44c671a73108412f9b63e0a9c84ce26799c3fe' 
  AND token = 'heuD+QCCzlDlz89ZkrYYZ4jEzl7yjAQTSch0f4Hi7jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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