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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067fe4b67b1825f451c3948a336fc034facf2d7e7f1efa5a245488e105f59b42' 
  AND token = '5ppqhddp281iIWVqfF4/+XG0XUeT635ljuakrH11aQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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