Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28799d41cc28e4f27c4cdf1f13ddad4dabb1b53cd9837fa52aa630b7dfd1b6e' 
  AND token = '1VB+tJRQyD2bPAd4heAHaYQvLCq5agDTugVWR6RlvrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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