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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206b72bf58b6bf65077ec122edff87f85b745696c494824a4d37e6b841011558' 
  AND token = '4w01Ou3S91kTzBxDt8jNk7S2bwY4dfUNzGFAPbj5O90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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