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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fe800602f28b032f03903e56af739ae9c0525de50a35b262557ab6809e21d5' 
  AND token = '9BGciJTHp6CBpqb9dIu2sicbuDbO9xDGg5BuU6VlNII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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