SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3055d20ce4e18f8eb7a1c399427b9361cfc4660d993275b6a9bc49cace58b610' 
  AND token = 'GG2LZB55+x17lsyW+pRnX0N1qmJZ8LmNoKkF3lVh0HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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