SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a485587fc020bf38d0df0f25d8f9acda16ba2099798dc43fb85d970a7f68eb' 
  AND token = 'OrfRLMFxXYl3Q0wFLTFqeg1PSMo6vP7XB+bJpM2hn+g=' 
  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"
    }
  }
}