SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f598a2489a032cb35c8a327a9ac9076fe921341b07c3202f6995a47079049770' 
  AND token = 'JvlHBK/wCHVr7qsHrbghseH4kToK4ncW4TkZNGGvJlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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