SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9667c36a99cd7fe9f14131e765e1f1c02585e991455af79649b61d5d73834e' 
  AND token = '45+jli/WHbYu4SxMRnsyHVz0YUnwmDH/LgQ7kzGjVIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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