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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dc012ee5959584c6dde5797e39b5da50079daa74c449704f02882a4352ff68' 
  AND token = '4iP40eHuRYe1zvVa/qoGrZr3U6a8XaGvvaWPRTG99Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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