SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9d8c48a1a246896f5031ff0ecfb42557b47eed20ad1c9231ffb435372c5b6e' 
  AND token = 'iwfZOGIQQ4SSY0/z9yPd1dJQ1vDgPhAvju03q4nAwnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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