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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36264049c601c806f45e08e808d0f46b581a0054e48b80a68869368138788841' 
  AND token = 'YQb9B3h+BIcV/bMDL7K6cFYOtDiBDQKxPJPXlkav4K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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