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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58c56db8c756e87c8ba0ffb560f884de08994a85f9c0d27ca1ca4ca28d76d4b' 
  AND token = '/9HRClT51y0EJhpnfw8Vji2ONSo6owhBlwWN0Wi6gCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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