SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb34b777e58f5d73352114a3eab09976e22afba110488490d558a1e0d1d1a143' 
  AND token = 'cSyKzf6dg4f6U8+eiVvt1ZVG8Xz9+vcUB/BpsAlKKwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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