SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0597d2d9b352830e828842887ed7cd69bf326b3487913a8be05b4a0b44d7410' 
  AND token = '3auT8BEz+YI/wYGcwOy7HfKKNRvjxy6LNm0Lmxg78qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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