SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ab1c83afed861273263817df54d9702607e89464d048d652100b07f65b299a' 
  AND token = 'lvKZzM2ms1C/AbgOtiFrJjZMGHQEZRUV5hBBaD6aVWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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