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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5d16e978f18d203825f6a75ebf1328c57412097f28fa65b89532920f946429' 
  AND token = 'Qt/gd3A6oWiuLC69N9Ho43w4oKBfy71mZksQe992XwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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