Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ef85302af824f38a46da69ec03f5c4ac6272bba33f029fef65286c87a1b7cb' 
  AND token = '4hd0ONJaLx50iqxZW1qeHUWxrntKh/qldO3bmIgSPEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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