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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dabd3bb859cc362ed88dbc0caf6420e661a12eae94dc61b6e8c69c43f391da7' 
  AND token = 'aEyPySM2SFf5MMXyuxnEaUbj8wN0S/eQ+0cluDeHjBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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