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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd930ffa90f50ed5f04903fe2ae3755f1ddfc2b7b1d0a6e9d8bfe15d903cbdd' 
  AND token = 'T/87j+5sBpAo8Pz8BhyBig/yf0EBbacsZI5FTimQvGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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