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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678e5d78df33e8d55bcc10b5b66da19d1ecaa6ccd207339148e58eb6b472ca85' 
  AND token = 'ry5HrtiweQ/pt7tlpcDYnxjSVqG2iUzdNB+fDIdEJF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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