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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac9682ac253020b15bb9c60f15e8f8de03f887b230b648ac1dc922326331d8e' 
  AND token = 'AJE0P89NKRvpp3hhaorxRYNdfenhijse8lQpno3qKDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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