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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ac2467d042358e91623d4068a8cb5957964571cee395746bb5ddb3b6bbd395' 
  AND token = 'Fl3FxsNdo0e4QizvuwuRGgeAmEhiOzZGbfDTqKOPLx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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