SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b67b3fcb74abcb3c7d6e402205d799a6744a00248493282cd657bc892d0a89f' 
  AND token = 'Ik9PGqBGPCHRQfNjX7gvnezAUlmZIi9KCjlA6bTwRzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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