SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1448d579edcaa739626d8af5c97173dc3023c791f944680cf1dd4ff0e301bc5' 
  AND token = 'Cj38z8KftcBLu+zlmOy2/auqOVoRJZUkpaA9H6lO3jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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