Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d8d47bf1bcdefd3789ff6b8829da75dcfe49d4d947919d5d9e860ffb433a28' 
  AND token = 'd0iwBVSUiNJV6xohr+lO6HDRQagHZ5swCmrYlReIqk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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